Globally, Byr (Willoughby 
, Byr 
) is a rare epicene first name. The forename Byr is characteristic of Ireland, where it is a rare masculine name, Nigeria, where it is a rare gender-neutral name, and the United Kingdom, where it is a very rare masculine name. Measured by absolute frequency, it is the most numerous in Nigeria, the United States, and the United Kingdom. More prevalently, Byr is the last name as well as the forename.
Byr is also a name for the fictitious and mythical characters: Willoughby Kipling , the DC Comics / Vertigo Comics fictional character, Doom Patrol; Willoughby , the animated character and Willoughby , the operatic character in the opera The Rising of the Moon by Nicholas Maw.